My new tool

ike126

Hemispherical

Interesting.

This assumes ones near, mid, and far visions is 20/20 or correctible to 20/20.

ricko

One more tool in the numismatist's tool box....I wonder if any of the TPG's are using it....@Insider2...any input here?? Cheers, RickO

Aspie_Rocco

Cool, I first saw those tools in this thread https://forums.collectors.com/discussion/1014609/how-or-is-the-depth-of-a-mirror-measured#latest

Timbuk3

Interesting !!!

sellitstore

Since it's in the workshop, you could just use a yardstick.

Aspie_Rocco

Someone should test the new Kennedy rocket ship half with this tool!

1775

Interesting tool / I also use my tape measure to hold up coins